I have mixed feelings about this. Saying something like that in front of young children isn't appropriate, because there is a good chance it will scare them about mommy drinking it. Then again, her husband may have died fairly recently and she could have been still grieving and seeing the alcohol could have been a trigger for her; after my brother died I had a hard time watching people buy sleeping pills and while I would never have said anything to anyone about it, I'm not a vocal person and some people are. One thing I've learned working in a grocery store though, is that people volunteer random shit all the time...for every inappropriate comment a cashier makes like this, said cashier has probably heard three from customers.
On a totally unrelated note, Pip, I read your favorite day was the day after seniors came in, and I cracked up